The gamma-glutamyl cycle is a six-enzyme cycle that represents the primary pathway for glutathione synthesis and degradation. One step is the cleavage of 5-oxo-L-proline (OPRO) to form L-glutamate, coupled to the hydrolysis of ATP. This is catalysed by 5-oxoprolinase (OPLAH) is a homodimeric, cytosolic protein. Defects in OPLAH can cause 5-oxoprolinase deficiency (OPLAHD; MIM:260005), an extremely rare disorder of the gamma-glutamyl cycle about which debate continues as to whether it is a disorder or just a biochemical condition with no adverse clinical effects apart from 5-oxoprolinuria. Mutations that can cause OPLAHD are S323R, V1089I and H870Pfs*92 (Calpena et al. 2013, Almaghlouth et al. 2012).
Almaghlouth, IA, Mohamed, JY, Al-Amoudi, M, Al-Ahaidib, L, Al-Odaib, A, Alkuraya, FS
Calpena, E, Casado, M, Martínez-Rubio, D, Nascimento, A, Colomer, J, Gargallo, E, Garcia-Cazorla, A, Palau, F, Artuch, R, Espinós, C
5-oxoprolinase (ATP-hydrolyzing) activity of OPLAH mutants [cytosol]
Loss of function of OPLAH mutants [cytosol]
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